Well, it’s confirmed. The iPhone 4 will have 512MB of RAM, which is double (yes, double!) the amount of RAM the iPhone 3GS and iPad have. With the iPhone 4’s 512MB of RAM, it’s triple the amount of the original iPhone. So, this is probably why iMovie for iPhone will only run on the iPhone, is because of the vast amount of RAM needed for the video editing. A long side with the amount of RAM needed for iMovie for iPhone, that amount of RAM is still needed for multitasking to work perfectly. The iPhone 4 will also sport the Apple A4 system on a chip processor, which also aid in have multitasking work perfect.